使用 MongoDB + Mongoose 时无法解析 $GeoNear 索引答案

【问题标题】：Unable to resolve $GeoNear indices when using MongoDB + Mongoose使用 MongoDB + Mongoose 时无法解析 $GeoNear 索引
【发布时间】：2018-06-26 16:13:53
【问题描述】：

我在 mongo / mongoose 文档和堆栈溢出中花了一天时间，似乎无法弄清楚这一点。

这是我的基本架构设置：

const mongoose = require('mongoose');
const config = require('./config/config');
const db = mongoose.createConnection(config.uri, { autoIndex: false });

const storeSchema = mongoose.Schema({
  name: String,
  location: { type:[Number], index:'2dsphere', required:true },
});

const Store = db.model('Store', storeSchema);

我也试过了：

const storeSchema = mongoose.Schema({
  name: String,
  location: { type: { type: String }, coordinates: [Number] },
});

storeSchema.index({ location: "2dsphere" });

我在 createConnection 上将 autoIndex 设置为 false，因为在应用程序启动时 Mongoose automatically calls createIndex 并且 $geoNear 查询要求只有一个索引。我想可能是 Mongoose 正在创建重复索引，但这并没有解决问题。

我创建这样的商店记录（简化）：

const coordinates = { lng: -122.0266515, lat: 36.9743292 }

Store.create({
  name: "My Store", 
  location: [coordinates.lng, coordinates.lat], 
})

这是我返回错误的查询：

const location = { longitude: -122.026423, latitude: 36.974538 } 
// above coordinates are near the 'My Store' record's coordinates.

const point = {
  type: "Point",
  coordinates: [location.longitude, location.latitude]  
}

Store.aggregate([{
  $geoNear: {
    near: point,
    distanceField: "dist.calculated",
    maxDistance: 100000,
    spherical: true                
    }
  }
])
.then((results) => console.log(results))
.catch((error) => console.log(error));

这是我得到的“geoNear 没有地理索引” 错误：

{ MongoError: geoNear command failed: { ok: 0.0, errmsg: "no geo indices 
for geoNear", operationTime: Timestamp(1529989103, 8), $clusterTime: { 
clusterTime: Timestamp(1529989103, 8), signature: { hash: BinData(0, 
0000000000000000000000000000000000000000), keyId: 0 } } }
at queryCallback (/Users/`...`/node_modules/mongodb- 
core/lib/cursor.js:244:25)
at /Users/`...`/node_modules/mongodb- 
core/lib/connection/pool.js:544:18
at process._tickCallback (internal/process/next_tick.js:150:11)
name: 'MongoError',
message: 'geoNear command failed: { ok: 0.0, errmsg: "no geo indices for 
geoNear", operationTime: Timestamp(1529989103, 8), $clusterTime: { 
clusterTime: Timestamp(1529989103, 8), signature: { hash: BinData(0, 
0000000000000000000000000000000000000000), keyId: 0 } } }',
operationTime: Timestamp { _bsontype: 'Timestamp', low_: 8, high_: 
1529989103 },
ok: 0,
errmsg: 'geoNear command failed: { ok: 0.0, errmsg: "no geo indices for 
geoNear", operationTime: Timestamp(1529989103, 8), $clusterTime: { 
clusterTime: Timestamp(1529989103, 8), signature: { hash: BinData(0, 
0000000000000000000000000000000000000000), keyId: 0 } } }',
code: 16604,
codeName: 'Location16604',
'$clusterTime':
{ clusterTime: Timestamp { _bsontype: 'Timestamp', low_: 8, high_: 
1529989103 },
`enter code here`signature: { hash: [Binary], keyId: [Long] } } }

当我 console.log storeSchema.index()._indexes 我得到以下信息：

[ [ { location: '2dsphere' }, {} ], [ {}, {} ] ]

...所以索引似乎在那里。

我还尝试在运行查询 after seeing the following stack overflow conversation 之前调用 ensureIndexes。

Store.ensureIndexes({location: '2dsphere'})

【问题讨论】：

标签： node.js mongodb mongoose geospatial geocoding

【解决方案1】：

好的，所以我发现这个错误实际上与我创建数据库实例时 MongoDB Atlas 提供的 URI 有关。

具体来说，他们提供的 URI（我已复制并粘贴）如下所示：

mongodb+srv://user:password@host.mongodb.net? 
readPreference=primaryPreferred&retryWrites=true

删除“retryWrites=true”为我解决了这个问题。此处提供更多详细信息：

https://github.com/Automattic/mongoose/issues/6109

【讨论】：